LSB258 Lecture Notes - Lecture 10: Vasoconstriction, Sex Steroid, Autonomic Nervous System

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Lsb258 principles of human physiology integrative physiology. Somatic division of nervous system activates skeletal muscles: nervous system regulates muscle force production. Skeletal muscles are effectors of the somatic division xw. Sympathetic division of the autonomic nervous system (ans) activates the adrenal medulla: hypothalamus helps regulate the activity of the anterior pituitary gland. Produces the two posterior pituitary hormones (oxytocin and adh: hormones influence neuronal metabolism, ans helps regulate heart rate, blood pressure and blood flow to skin. Kidneys help dispose of metabolic wastes and maintain proper electrolyte. Composition and ph of blood for neural functioning: ans regulates sexual arousal. Testosterone causes masculinisation of the brain and underlies sex drive and aggressive behaviour. Muscular system: growth hormone is essential for normal muscular development. Several hormones (adrenaline, atrial natriuretic peptide, angiotensin ii, thyroxine, Adh) influence blood volume, blood pressure and heart contractility. Erythropoietin stimulates red blood cell production: blood is the main transport medium of hormones; heart produces atrial natriuretic peptide.

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